Spin Dependence of Small-Angle Proton-Nucleus Scattering

2017/11/06 by Krelina, Michal, Kopeliovich, Boris Z.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.1711.01969

Abstract

We study the single-spin asymmetry, A_N(t), arising from Coulomb-nuclear interference (CNI) at small 4-momentum transfer squared, -t=q², aiming at explanation of the recent data from the PHENIX experiment at RHIC on polarized proton-nucleus scattering, exposing a nontrivial t-dependence of A_N. We found that the failure of previous theoretical attempts to explain these data, was due to lack of absorptive corrections in the Coulomb amplitude of pA elastic scattering. Our prominent observation is that the main contribution to A_N(t) comes from interference of the amplitudes of ultra-peripheral and central collisions.

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